<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>指令修饰符</title>
</head>
<body>
    <div id="app">
        <h3>监听键盘回车事件</h3>
        <input @keyup="fn" type="text">
        <input type="text" v-model.number="username">
    </div>
</body>
<script src="https://cdn.jsdelivr.net/npm/vue@2.7.16/dist/vue.js"></script>

<script>
    const app = new Vue({
        el:'#app',
        data:{
            username:''
        },
        methods:{
            fn(event){
                if(event.key == 'Enter') {
                    console.log("回车事件触发！！！");
                }
            }
        }
    })
</script>

</html>